if you are here in Thailand you are in the best place to get first-hand information and your lack of knowledge of Thai will not be any hindrance. These matters have also been discussed at great length on other threads in these forums, but the quick reply is:
1. A TESOL certificate is a requirement posed by only some schools - usually the better ones. It is neither required by the government nor will help you obtain legal employment.
2. A degree is mandatory - you won't get a visa or a visa extension for teaching without one, it will also be required by the Labour Office for your Work Permit, and it will also be needed to obtain a teacher licence.
Some government schools in very remote areas are able to obtain a special dispensation for employing a teacher without a degree, but you would need to provide adequate provable eperience, and you will be required to obtain a degree within two years. There is no 'Interviewing Officer'.
I hope this helps.
I offer any information or advice 'as is' and hope that it has been of help. I am not an admin of this board, and my postings do not necessarily reflect the opinions of the board management.
____________________Thailand TESOL forum